Frankfurt 2014 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 63: Schwerionenkollisionen und QCD Phasen

HK 63.8: Vortrag

Freitag, 21. März 2014, 15:45–16:00, HZ 6

What happens actually in multinucleon transfer reactions ? — Geneviève Mouze and •Christian Ythier — Faculté des Sciences,Université de Nice, 06108 Nice cedex 2,France

In the 90Zr + 208Pb reaction at 560 MeV identical Gaussian isotopic distributions having a width of 2.5 u are observed for products of Z comprised between 40 and 32 [1]: Are they really due to a multineutron pick-up process accompanying any proton stripping, as believed today [2] ? In fact they are distributions of the neutron number N of the product around its most probable value: This uncertainty in N results from the lifetime of only 0.17 yoctosecond of a new state of nuclear matter, which has been also found in the fission reaction[3]. Interestingly, the new state is characterized by the disappearance of any proton charge and might be triggered, in fission, by a combined shifting of the proton phase against the neutron phase of ordinary matter: It may be asked whether this state is triggered, in transfer reactions, by the crossing of the Coulomb barrier, at which any proton charge should logically disappear. [1] C.A. Ur et al., Fusion 06,A.I.P., vol.853 (2006) p.43. [2] G. Pollarolo, Fusion 06,A.I.P., vol.853 (2006) p.29. [3] G. Mouze et al., http://arxiv.org/abs/1004.1337